/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.core.namedparam;

import org.springframework.jdbc.core.SqlParameterValue;

import java.util.HashMap;
import java.util.Map;

/**
 * Class that provides helper methods for the use of {@link SqlParameterSource}
 * with {@code SimpleJdbc} classes.
 *
 * @author Thomas Risberg
 * @since 2.5
 */
public class SqlParameterSourceUtils {

    /**
     * Create an array of MapSqlParameterSource objects populated with data from the
     * values passed in. This will define what is included in a batch operation.
     *
     * @param valueMaps array of Maps containing the values to be used
     * @return an array of SqlParameterSource
     */
    public static SqlParameterSource[] createBatch(Map[] valueMaps) {
        MapSqlParameterSource[] batch = new MapSqlParameterSource[valueMaps.length];
        for (int i = 0; i < valueMaps.length; i++) {
            Map valueMap = valueMaps[i];
            batch[i] = new MapSqlParameterSource(valueMap);
        }
        return batch;
    }

    /**
     * Create an array of BeanPropertySqlParameterSource objects populated with data
     * from the values passed in. This will define what is included in a batch operation.
     *
     * @param beans object array of beans containing the values to be used
     * @return an array of SqlParameterSource
     */
    public static SqlParameterSource[] createBatch(Object[] beans) {
        BeanPropertySqlParameterSource[] batch = new BeanPropertySqlParameterSource[beans.length];
        for (int i = 0; i < beans.length; i++) {
            Object bean = beans[i];
            batch[i] = new BeanPropertySqlParameterSource(bean);
        }
        return batch;
    }

    /**
     * Create a wrapped value if parameter has type information, plain object if not.
     *
     * @param source        the source of paramer values and type information
     * @param parameterName the name of the parameter
     * @return the value object
     */
    public static Object getTypedValue(SqlParameterSource source, String parameterName) {
        int sqlType = source.getSqlType(parameterName);
        if (sqlType != SqlParameterSource.TYPE_UNKNOWN) {
            if (source.getTypeName(parameterName) != null) {
                return new SqlParameterValue(sqlType, source.getTypeName(parameterName), source.getValue(parameterName));
            } else {
                return new SqlParameterValue(sqlType, source.getValue(parameterName));
            }
        } else {
            return source.getValue(parameterName);
        }
    }

    /**
     * Create a Map of case insensitive parameter names together with the original name.
     *
     * @param parameterSource the source of paramer names
     * @return the Map that can be used for case insensitive matching of parameter names
     */
    public static Map extractCaseInsensitiveParameterNames(SqlParameterSource parameterSource) {
        Map caseInsensitiveParameterNames = new HashMap();
        if (parameterSource instanceof BeanPropertySqlParameterSource) {
            String[] propertyNames = ((BeanPropertySqlParameterSource) parameterSource).getReadablePropertyNames();
            for (int i = 0; i < propertyNames.length; i++) {
                String name = propertyNames[i];
                caseInsensitiveParameterNames.put(name.toLowerCase(), name);
            }
        } else if (parameterSource instanceof MapSqlParameterSource) {
            for (String name : ((MapSqlParameterSource) parameterSource).getValues().keySet()) {
                caseInsensitiveParameterNames.put(name.toLowerCase(), name);
            }
        }
        return caseInsensitiveParameterNames;
    }

}
